"I got no intentions of becoming a captain. Becoming a captain would mean that I can't fight under Captain Zaraki. If your wish is to surpass Kuchiki Byakuya... then I just have one wish: to fight and die under that man's command. That's all."

"[to Szayel Aporro Grantz] Immaculate being... Was it? In this secular existence, perfection is an illusion, regardless of those who utter the contrary. This is the reality. Common man seeks it out, they strive to achieve it, as if it were some tangible thing... But... The fact of the matter is, perfection is a hollow shell. It is devoid of any substance. I spit on perfection. Perfection, after all, implies you've reached the summit. No trial and error, no ability to conceptualize. An omniscient being would have no need for such superfluous things... Am I making myself clear? For people who dabble in the sciences, such as ourselves, perfection would make us obsolete. Many magnificent things have been, and will continue to come into existence... And yet every last one of them will fall short of perfection's finish. Our function as men of science relies on their many shortcomings. Then, and only then, can we apply the fruits of our labor. To put it simply... As soon as you began spouting that nonsense about being an immaculate being... your fate was sealed. How dare you call yourself a man of science?"

"It's been a while! Or something like that..."

"Don’t hesitate to cut the enemy. Don’t falter to finish them off. Much less heal their wounds. That’s unspeakable, nino. Leave the chocolate here. Become a demon, nino. As strong as a demon. As wicked as a demon. You have to learn that the only way to stand up against ruthlessness, is to become ruthless yourself."

"Discouraging, isn't it? It's always easier to tear down than to build... And much more difficult to tie than to untie."

"Ichigo...I know this is shameful, but I'm begging you -- Rukia...Please save Rukia!!"

"[to an arrogant projectile-specialist Shinigami] Apparently, on this side, "ultimate master" means a windbag with diarrhea of the mouth."